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Fixed Assets and Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Fixed Assets And Asset Retirement Obligations [Abstract]  
Schedule of Fixed Assets
Fixed assets consisted of the following:
 
December 31,
 
2018
 
2017
Crude oil pipelines and natural gas pipelines and related assets
$
2,918,285

 
$
3,028,657

Alkali facilities, machinery, and equipment
533,924

 
497,601

Onshore facilities, machinery, and equipment
639,023

 
692,364

Transportation equipment
20,102

 
21,483

Marine vessels
951,597

 
918,953

Land, buildings and improvements
222,242

 
223,186

Office equipment, furniture and fixtures
20,505

 
18,112

Construction in progress
94,025

 
151,768

Other
41,155

 
48,891

Fixed assets, at cost
5,440,858

 
5,601,015

Less: Accumulated depreciation
(1,023,825
)
 
(734,986
)
Net fixed assets
$
4,417,033

 
$
4,866,029
Schedule of Mineral Leaseholds
Mineral Leaseholds
Our Mineral Leaseholds, relating to our acquired Alkali Business, consist of the following:
 
December 31,
2018
 
December 31,
2017
Mineral leaseholds
566,019

 
566,019

Less: Accumulated depletion
(5,538
)
 
(1,513
)
Mineral leaseholds, net
$
560,481

 
$
564,506
Schedule of Change in Asset Retirement Obligation
A reconciliation of our liability for asset retirement obligations is as follows:

December 31, 2016
$
213,726

Accretion expense
11,008

Revisions in timing and estimated costs of AROs
7,146

Acquisitions
131

Divestitures
(7,649
)
Settlements
(26,415
)
Other
240

December 31, 2017
198,187

Accretion expense
10,509

Revisions in timing and estimated costs of AROs
44,319

Settlements
(13,150
)
December 31, 2018
$
239,865
Schedule of Forecast or Accretion Expense to Asset Retirement Obligations
With respect to our AROs, the following table presents our forecast of accretion expense for the periods indicated:
2019
$
9,928

2020
$
10,997

2021
$
9,313

2022
$
9,892

2023
$
10,586